Question

what's the answer
of the above activity




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Answer 1

Step-by-step explanation:

Sn = n/2 [2a + (n- 1) d ]

= 45/2 [ 2a+ (45-1) d ]

3195 = 45/2 [ 2a + 44d ]

3195 = 45 × a + 22d

3195 = 45a + 990d

Hope this helps